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![YOSHIFUJI Hideaki](/assets/img/avatar_default.png)
Without CONFIG_NET_NS, namespace is always &init_net. Compiler will be able to omit namespace comparisons with this patch. Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
1672 lines
36 KiB
C
1672 lines
36 KiB
C
/*
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* Linux IPv6 multicast routing support for BSD pim6sd
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* Based on net/ipv4/ipmr.c.
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*
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* (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr>
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* LSIIT Laboratory, Strasbourg, France
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* (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com>
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* 6WIND, Paris, France
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* Copyright (C)2007,2008 USAGI/WIDE Project
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* YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/fcntl.h>
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#include <linux/stat.h>
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#include <linux/socket.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/inetdevice.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <net/protocol.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/raw.h>
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#include <linux/notifier.h>
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#include <linux/if_arp.h>
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#include <net/checksum.h>
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#include <net/netlink.h>
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#include <net/ipv6.h>
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#include <net/ip6_route.h>
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#include <linux/mroute6.h>
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#include <linux/pim.h>
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#include <net/addrconf.h>
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#include <linux/netfilter_ipv6.h>
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struct sock *mroute6_socket;
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/* Big lock, protecting vif table, mrt cache and mroute socket state.
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Note that the changes are semaphored via rtnl_lock.
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*/
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static DEFINE_RWLOCK(mrt_lock);
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/*
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* Multicast router control variables
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*/
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static struct mif_device vif6_table[MAXMIFS]; /* Devices */
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static int maxvif;
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#define MIF_EXISTS(idx) (vif6_table[idx].dev != NULL)
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static int mroute_do_assert; /* Set in PIM assert */
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#ifdef CONFIG_IPV6_PIMSM_V2
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static int mroute_do_pim;
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#else
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#define mroute_do_pim 0
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#endif
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static struct mfc6_cache *mfc6_cache_array[MFC6_LINES]; /* Forwarding cache */
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static struct mfc6_cache *mfc_unres_queue; /* Queue of unresolved entries */
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static atomic_t cache_resolve_queue_len; /* Size of unresolved */
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/* Special spinlock for queue of unresolved entries */
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static DEFINE_SPINLOCK(mfc_unres_lock);
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/* We return to original Alan's scheme. Hash table of resolved
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entries is changed only in process context and protected
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with weak lock mrt_lock. Queue of unresolved entries is protected
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with strong spinlock mfc_unres_lock.
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In this case data path is free of exclusive locks at all.
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*/
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static struct kmem_cache *mrt_cachep __read_mostly;
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static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache);
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static int ip6mr_cache_report(struct sk_buff *pkt, mifi_t mifi, int assert);
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static int ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm);
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#ifdef CONFIG_IPV6_PIMSM_V2
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static struct inet6_protocol pim6_protocol;
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#endif
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static struct timer_list ipmr_expire_timer;
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#ifdef CONFIG_PROC_FS
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struct ipmr_mfc_iter {
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struct mfc6_cache **cache;
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int ct;
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};
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static struct mfc6_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos)
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{
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struct mfc6_cache *mfc;
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it->cache = mfc6_cache_array;
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read_lock(&mrt_lock);
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for (it->ct = 0; it->ct < ARRAY_SIZE(mfc6_cache_array); it->ct++)
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for (mfc = mfc6_cache_array[it->ct]; mfc; mfc = mfc->next)
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if (pos-- == 0)
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return mfc;
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read_unlock(&mrt_lock);
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it->cache = &mfc_unres_queue;
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spin_lock_bh(&mfc_unres_lock);
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for (mfc = mfc_unres_queue; mfc; mfc = mfc->next)
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if (pos-- == 0)
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return mfc;
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spin_unlock_bh(&mfc_unres_lock);
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it->cache = NULL;
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return NULL;
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}
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/*
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* The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif
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*/
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struct ipmr_vif_iter {
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int ct;
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};
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static struct mif_device *ip6mr_vif_seq_idx(struct ipmr_vif_iter *iter,
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loff_t pos)
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{
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for (iter->ct = 0; iter->ct < maxvif; ++iter->ct) {
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if (!MIF_EXISTS(iter->ct))
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continue;
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if (pos-- == 0)
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return &vif6_table[iter->ct];
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}
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return NULL;
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}
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static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
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__acquires(mrt_lock)
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{
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read_lock(&mrt_lock);
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return (*pos ? ip6mr_vif_seq_idx(seq->private, *pos - 1)
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: SEQ_START_TOKEN);
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}
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static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct ipmr_vif_iter *iter = seq->private;
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++*pos;
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if (v == SEQ_START_TOKEN)
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return ip6mr_vif_seq_idx(iter, 0);
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while (++iter->ct < maxvif) {
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if (!MIF_EXISTS(iter->ct))
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continue;
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return &vif6_table[iter->ct];
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}
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return NULL;
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}
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static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
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__releases(mrt_lock)
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{
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read_unlock(&mrt_lock);
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}
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static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
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{
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if (v == SEQ_START_TOKEN) {
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seq_puts(seq,
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"Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
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} else {
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const struct mif_device *vif = v;
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const char *name = vif->dev ? vif->dev->name : "none";
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seq_printf(seq,
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"%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
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vif - vif6_table,
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name, vif->bytes_in, vif->pkt_in,
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vif->bytes_out, vif->pkt_out,
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vif->flags);
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}
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return 0;
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}
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static struct seq_operations ip6mr_vif_seq_ops = {
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.start = ip6mr_vif_seq_start,
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.next = ip6mr_vif_seq_next,
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.stop = ip6mr_vif_seq_stop,
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.show = ip6mr_vif_seq_show,
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};
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static int ip6mr_vif_open(struct inode *inode, struct file *file)
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{
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return seq_open_private(file, &ip6mr_vif_seq_ops,
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sizeof(struct ipmr_vif_iter));
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}
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static struct file_operations ip6mr_vif_fops = {
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.owner = THIS_MODULE,
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.open = ip6mr_vif_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
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{
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return (*pos ? ipmr_mfc_seq_idx(seq->private, *pos - 1)
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: SEQ_START_TOKEN);
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}
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static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct mfc6_cache *mfc = v;
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struct ipmr_mfc_iter *it = seq->private;
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++*pos;
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if (v == SEQ_START_TOKEN)
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return ipmr_mfc_seq_idx(seq->private, 0);
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if (mfc->next)
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return mfc->next;
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if (it->cache == &mfc_unres_queue)
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goto end_of_list;
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BUG_ON(it->cache != mfc6_cache_array);
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while (++it->ct < ARRAY_SIZE(mfc6_cache_array)) {
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mfc = mfc6_cache_array[it->ct];
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if (mfc)
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return mfc;
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}
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/* exhausted cache_array, show unresolved */
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read_unlock(&mrt_lock);
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it->cache = &mfc_unres_queue;
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it->ct = 0;
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spin_lock_bh(&mfc_unres_lock);
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mfc = mfc_unres_queue;
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if (mfc)
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return mfc;
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end_of_list:
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spin_unlock_bh(&mfc_unres_lock);
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it->cache = NULL;
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return NULL;
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}
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static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
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{
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struct ipmr_mfc_iter *it = seq->private;
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if (it->cache == &mfc_unres_queue)
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spin_unlock_bh(&mfc_unres_lock);
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else if (it->cache == mfc6_cache_array)
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read_unlock(&mrt_lock);
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}
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static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
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{
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int n;
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if (v == SEQ_START_TOKEN) {
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seq_puts(seq,
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"Group "
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"Origin "
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"Iif Pkts Bytes Wrong Oifs\n");
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} else {
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const struct mfc6_cache *mfc = v;
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const struct ipmr_mfc_iter *it = seq->private;
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seq_printf(seq,
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NIP6_FMT " " NIP6_FMT " %-3d %8ld %8ld %8ld",
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NIP6(mfc->mf6c_mcastgrp), NIP6(mfc->mf6c_origin),
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mfc->mf6c_parent,
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mfc->mfc_un.res.pkt,
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mfc->mfc_un.res.bytes,
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mfc->mfc_un.res.wrong_if);
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if (it->cache != &mfc_unres_queue) {
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for (n = mfc->mfc_un.res.minvif;
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n < mfc->mfc_un.res.maxvif; n++) {
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if (MIF_EXISTS(n) &&
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mfc->mfc_un.res.ttls[n] < 255)
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seq_printf(seq,
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" %2d:%-3d",
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n, mfc->mfc_un.res.ttls[n]);
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}
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}
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seq_putc(seq, '\n');
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}
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return 0;
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}
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static struct seq_operations ipmr_mfc_seq_ops = {
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.start = ipmr_mfc_seq_start,
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.next = ipmr_mfc_seq_next,
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.stop = ipmr_mfc_seq_stop,
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.show = ipmr_mfc_seq_show,
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};
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static int ipmr_mfc_open(struct inode *inode, struct file *file)
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{
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return seq_open_private(file, &ipmr_mfc_seq_ops,
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sizeof(struct ipmr_mfc_iter));
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}
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static struct file_operations ip6mr_mfc_fops = {
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.owner = THIS_MODULE,
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.open = ipmr_mfc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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#endif
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#ifdef CONFIG_IPV6_PIMSM_V2
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static int reg_vif_num = -1;
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static int pim6_rcv(struct sk_buff *skb)
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{
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struct pimreghdr *pim;
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struct ipv6hdr *encap;
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struct net_device *reg_dev = NULL;
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if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
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goto drop;
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pim = (struct pimreghdr *)skb_transport_header(skb);
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if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) ||
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(pim->flags & PIM_NULL_REGISTER) ||
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(ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
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csum_fold(skb_checksum(skb, 0, skb->len, 0))))
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goto drop;
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/* check if the inner packet is destined to mcast group */
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encap = (struct ipv6hdr *)(skb_transport_header(skb) +
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sizeof(*pim));
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if (!ipv6_addr_is_multicast(&encap->daddr) ||
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encap->payload_len == 0 ||
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ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
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goto drop;
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read_lock(&mrt_lock);
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if (reg_vif_num >= 0)
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reg_dev = vif6_table[reg_vif_num].dev;
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if (reg_dev)
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dev_hold(reg_dev);
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read_unlock(&mrt_lock);
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if (reg_dev == NULL)
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goto drop;
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skb->mac_header = skb->network_header;
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skb_pull(skb, (u8 *)encap - skb->data);
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skb_reset_network_header(skb);
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skb->dev = reg_dev;
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skb->protocol = htons(ETH_P_IP);
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skb->ip_summed = 0;
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skb->pkt_type = PACKET_HOST;
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dst_release(skb->dst);
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reg_dev->stats.rx_bytes += skb->len;
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reg_dev->stats.rx_packets++;
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skb->dst = NULL;
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nf_reset(skb);
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netif_rx(skb);
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dev_put(reg_dev);
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return 0;
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drop:
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kfree_skb(skb);
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return 0;
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}
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|
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static struct inet6_protocol pim6_protocol = {
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.handler = pim6_rcv,
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};
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|
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/* Service routines creating virtual interfaces: PIMREG */
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|
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static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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read_lock(&mrt_lock);
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dev->stats.tx_bytes += skb->len;
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dev->stats.tx_packets++;
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ip6mr_cache_report(skb, reg_vif_num, MRT6MSG_WHOLEPKT);
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read_unlock(&mrt_lock);
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kfree_skb(skb);
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return 0;
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}
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|
|
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static void reg_vif_setup(struct net_device *dev)
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{
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dev->type = ARPHRD_PIMREG;
|
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dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
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dev->flags = IFF_NOARP;
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dev->hard_start_xmit = reg_vif_xmit;
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dev->destructor = free_netdev;
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}
|
|
|
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static struct net_device *ip6mr_reg_vif(void)
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{
|
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struct net_device *dev;
|
|
|
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dev = alloc_netdev(0, "pim6reg", reg_vif_setup);
|
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if (dev == NULL)
|
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return NULL;
|
|
|
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if (register_netdevice(dev)) {
|
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free_netdev(dev);
|
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return NULL;
|
|
}
|
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dev->iflink = 0;
|
|
|
|
if (dev_open(dev))
|
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goto failure;
|
|
|
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dev_hold(dev);
|
|
return dev;
|
|
|
|
failure:
|
|
/* allow the register to be completed before unregistering. */
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rtnl_unlock();
|
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rtnl_lock();
|
|
|
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unregister_netdevice(dev);
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return NULL;
|
|
}
|
|
#endif
|
|
|
|
/*
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|
* Delete a VIF entry
|
|
*/
|
|
|
|
static int mif6_delete(int vifi)
|
|
{
|
|
struct mif_device *v;
|
|
struct net_device *dev;
|
|
if (vifi < 0 || vifi >= maxvif)
|
|
return -EADDRNOTAVAIL;
|
|
|
|
v = &vif6_table[vifi];
|
|
|
|
write_lock_bh(&mrt_lock);
|
|
dev = v->dev;
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v->dev = NULL;
|
|
|
|
if (!dev) {
|
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write_unlock_bh(&mrt_lock);
|
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return -EADDRNOTAVAIL;
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
if (vifi == reg_vif_num)
|
|
reg_vif_num = -1;
|
|
#endif
|
|
|
|
if (vifi + 1 == maxvif) {
|
|
int tmp;
|
|
for (tmp = vifi - 1; tmp >= 0; tmp--) {
|
|
if (MIF_EXISTS(tmp))
|
|
break;
|
|
}
|
|
maxvif = tmp + 1;
|
|
}
|
|
|
|
write_unlock_bh(&mrt_lock);
|
|
|
|
dev_set_allmulti(dev, -1);
|
|
|
|
if (v->flags & MIFF_REGISTER)
|
|
unregister_netdevice(dev);
|
|
|
|
dev_put(dev);
|
|
return 0;
|
|
}
|
|
|
|
/* Destroy an unresolved cache entry, killing queued skbs
|
|
and reporting error to netlink readers.
|
|
*/
|
|
|
|
static void ip6mr_destroy_unres(struct mfc6_cache *c)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
atomic_dec(&cache_resolve_queue_len);
|
|
|
|
while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) {
|
|
if (ipv6_hdr(skb)->version == 0) {
|
|
struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
|
|
nlh->nlmsg_type = NLMSG_ERROR;
|
|
nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
|
|
skb_trim(skb, nlh->nlmsg_len);
|
|
((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -ETIMEDOUT;
|
|
rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid);
|
|
} else
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
kmem_cache_free(mrt_cachep, c);
|
|
}
|
|
|
|
|
|
/* Single timer process for all the unresolved queue. */
|
|
|
|
static void ipmr_do_expire_process(unsigned long dummy)
|
|
{
|
|
unsigned long now = jiffies;
|
|
unsigned long expires = 10 * HZ;
|
|
struct mfc6_cache *c, **cp;
|
|
|
|
cp = &mfc_unres_queue;
|
|
|
|
while ((c = *cp) != NULL) {
|
|
if (time_after(c->mfc_un.unres.expires, now)) {
|
|
/* not yet... */
|
|
unsigned long interval = c->mfc_un.unres.expires - now;
|
|
if (interval < expires)
|
|
expires = interval;
|
|
cp = &c->next;
|
|
continue;
|
|
}
|
|
|
|
*cp = c->next;
|
|
ip6mr_destroy_unres(c);
|
|
}
|
|
|
|
if (atomic_read(&cache_resolve_queue_len))
|
|
mod_timer(&ipmr_expire_timer, jiffies + expires);
|
|
}
|
|
|
|
static void ipmr_expire_process(unsigned long dummy)
|
|
{
|
|
if (!spin_trylock(&mfc_unres_lock)) {
|
|
mod_timer(&ipmr_expire_timer, jiffies + 1);
|
|
return;
|
|
}
|
|
|
|
if (atomic_read(&cache_resolve_queue_len))
|
|
ipmr_do_expire_process(dummy);
|
|
|
|
spin_unlock(&mfc_unres_lock);
|
|
}
|
|
|
|
/* Fill oifs list. It is called under write locked mrt_lock. */
|
|
|
|
static void ip6mr_update_thresholds(struct mfc6_cache *cache, unsigned char *ttls)
|
|
{
|
|
int vifi;
|
|
|
|
cache->mfc_un.res.minvif = MAXMIFS;
|
|
cache->mfc_un.res.maxvif = 0;
|
|
memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
|
|
|
|
for (vifi = 0; vifi < maxvif; vifi++) {
|
|
if (MIF_EXISTS(vifi) && ttls[vifi] && ttls[vifi] < 255) {
|
|
cache->mfc_un.res.ttls[vifi] = ttls[vifi];
|
|
if (cache->mfc_un.res.minvif > vifi)
|
|
cache->mfc_un.res.minvif = vifi;
|
|
if (cache->mfc_un.res.maxvif <= vifi)
|
|
cache->mfc_un.res.maxvif = vifi + 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int mif6_add(struct mif6ctl *vifc, int mrtsock)
|
|
{
|
|
int vifi = vifc->mif6c_mifi;
|
|
struct mif_device *v = &vif6_table[vifi];
|
|
struct net_device *dev;
|
|
int err;
|
|
|
|
/* Is vif busy ? */
|
|
if (MIF_EXISTS(vifi))
|
|
return -EADDRINUSE;
|
|
|
|
switch (vifc->mif6c_flags) {
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
case MIFF_REGISTER:
|
|
/*
|
|
* Special Purpose VIF in PIM
|
|
* All the packets will be sent to the daemon
|
|
*/
|
|
if (reg_vif_num >= 0)
|
|
return -EADDRINUSE;
|
|
dev = ip6mr_reg_vif();
|
|
if (!dev)
|
|
return -ENOBUFS;
|
|
err = dev_set_allmulti(dev, 1);
|
|
if (err) {
|
|
unregister_netdevice(dev);
|
|
dev_put(dev);
|
|
return err;
|
|
}
|
|
break;
|
|
#endif
|
|
case 0:
|
|
dev = dev_get_by_index(&init_net, vifc->mif6c_pifi);
|
|
if (!dev)
|
|
return -EADDRNOTAVAIL;
|
|
err = dev_set_allmulti(dev, 1);
|
|
if (err) {
|
|
dev_put(dev);
|
|
return err;
|
|
}
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Fill in the VIF structures
|
|
*/
|
|
v->rate_limit = vifc->vifc_rate_limit;
|
|
v->flags = vifc->mif6c_flags;
|
|
if (!mrtsock)
|
|
v->flags |= VIFF_STATIC;
|
|
v->threshold = vifc->vifc_threshold;
|
|
v->bytes_in = 0;
|
|
v->bytes_out = 0;
|
|
v->pkt_in = 0;
|
|
v->pkt_out = 0;
|
|
v->link = dev->ifindex;
|
|
if (v->flags & MIFF_REGISTER)
|
|
v->link = dev->iflink;
|
|
|
|
/* And finish update writing critical data */
|
|
write_lock_bh(&mrt_lock);
|
|
v->dev = dev;
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
if (v->flags & MIFF_REGISTER)
|
|
reg_vif_num = vifi;
|
|
#endif
|
|
if (vifi + 1 > maxvif)
|
|
maxvif = vifi + 1;
|
|
write_unlock_bh(&mrt_lock);
|
|
return 0;
|
|
}
|
|
|
|
static struct mfc6_cache *ip6mr_cache_find(struct in6_addr *origin, struct in6_addr *mcastgrp)
|
|
{
|
|
int line = MFC6_HASH(mcastgrp, origin);
|
|
struct mfc6_cache *c;
|
|
|
|
for (c = mfc6_cache_array[line]; c; c = c->next) {
|
|
if (ipv6_addr_equal(&c->mf6c_origin, origin) &&
|
|
ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp))
|
|
break;
|
|
}
|
|
return c;
|
|
}
|
|
|
|
/*
|
|
* Allocate a multicast cache entry
|
|
*/
|
|
static struct mfc6_cache *ip6mr_cache_alloc(void)
|
|
{
|
|
struct mfc6_cache *c = kmem_cache_alloc(mrt_cachep, GFP_KERNEL);
|
|
if (c == NULL)
|
|
return NULL;
|
|
memset(c, 0, sizeof(*c));
|
|
c->mfc_un.res.minvif = MAXMIFS;
|
|
return c;
|
|
}
|
|
|
|
static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
|
|
{
|
|
struct mfc6_cache *c = kmem_cache_alloc(mrt_cachep, GFP_ATOMIC);
|
|
if (c == NULL)
|
|
return NULL;
|
|
memset(c, 0, sizeof(*c));
|
|
skb_queue_head_init(&c->mfc_un.unres.unresolved);
|
|
c->mfc_un.unres.expires = jiffies + 10 * HZ;
|
|
return c;
|
|
}
|
|
|
|
/*
|
|
* A cache entry has gone into a resolved state from queued
|
|
*/
|
|
|
|
static void ip6mr_cache_resolve(struct mfc6_cache *uc, struct mfc6_cache *c)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
/*
|
|
* Play the pending entries through our router
|
|
*/
|
|
|
|
while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
|
|
if (ipv6_hdr(skb)->version == 0) {
|
|
int err;
|
|
struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
|
|
|
|
if (ip6mr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) {
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
|
|
} else {
|
|
nlh->nlmsg_type = NLMSG_ERROR;
|
|
nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
|
|
skb_trim(skb, nlh->nlmsg_len);
|
|
((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -EMSGSIZE;
|
|
}
|
|
err = rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid);
|
|
} else
|
|
ip6_mr_forward(skb, c);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd
|
|
* expects the following bizarre scheme.
|
|
*
|
|
* Called under mrt_lock.
|
|
*/
|
|
|
|
static int ip6mr_cache_report(struct sk_buff *pkt, mifi_t mifi, int assert)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct mrt6msg *msg;
|
|
int ret;
|
|
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
if (assert == MRT6MSG_WHOLEPKT)
|
|
skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
|
|
+sizeof(*msg));
|
|
else
|
|
#endif
|
|
skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
|
|
|
|
if (!skb)
|
|
return -ENOBUFS;
|
|
|
|
/* I suppose that internal messages
|
|
* do not require checksums */
|
|
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
if (assert == MRT6MSG_WHOLEPKT) {
|
|
/* Ugly, but we have no choice with this interface.
|
|
Duplicate old header, fix length etc.
|
|
And all this only to mangle msg->im6_msgtype and
|
|
to set msg->im6_mbz to "mbz" :-)
|
|
*/
|
|
skb_push(skb, -skb_network_offset(pkt));
|
|
|
|
skb_push(skb, sizeof(*msg));
|
|
skb_reset_transport_header(skb);
|
|
msg = (struct mrt6msg *)skb_transport_header(skb);
|
|
msg->im6_mbz = 0;
|
|
msg->im6_msgtype = MRT6MSG_WHOLEPKT;
|
|
msg->im6_mif = reg_vif_num;
|
|
msg->im6_pad = 0;
|
|
ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr);
|
|
ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr);
|
|
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
} else
|
|
#endif
|
|
{
|
|
/*
|
|
* Copy the IP header
|
|
*/
|
|
|
|
skb_put(skb, sizeof(struct ipv6hdr));
|
|
skb_reset_network_header(skb);
|
|
skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
|
|
|
|
/*
|
|
* Add our header
|
|
*/
|
|
skb_put(skb, sizeof(*msg));
|
|
skb_reset_transport_header(skb);
|
|
msg = (struct mrt6msg *)skb_transport_header(skb);
|
|
|
|
msg->im6_mbz = 0;
|
|
msg->im6_msgtype = assert;
|
|
msg->im6_mif = mifi;
|
|
msg->im6_pad = 0;
|
|
ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr);
|
|
ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr);
|
|
|
|
skb->dst = dst_clone(pkt->dst);
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
|
|
skb_pull(skb, sizeof(struct ipv6hdr));
|
|
}
|
|
|
|
if (mroute6_socket == NULL) {
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Deliver to user space multicast routing algorithms
|
|
*/
|
|
if ((ret = sock_queue_rcv_skb(mroute6_socket, skb)) < 0) {
|
|
if (net_ratelimit())
|
|
printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n");
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Queue a packet for resolution. It gets locked cache entry!
|
|
*/
|
|
|
|
static int
|
|
ip6mr_cache_unresolved(mifi_t mifi, struct sk_buff *skb)
|
|
{
|
|
int err;
|
|
struct mfc6_cache *c;
|
|
|
|
spin_lock_bh(&mfc_unres_lock);
|
|
for (c = mfc_unres_queue; c; c = c->next) {
|
|
if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
|
|
ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr))
|
|
break;
|
|
}
|
|
|
|
if (c == NULL) {
|
|
/*
|
|
* Create a new entry if allowable
|
|
*/
|
|
|
|
if (atomic_read(&cache_resolve_queue_len) >= 10 ||
|
|
(c = ip6mr_cache_alloc_unres()) == NULL) {
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
|
|
kfree_skb(skb);
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
/*
|
|
* Fill in the new cache entry
|
|
*/
|
|
c->mf6c_parent = -1;
|
|
c->mf6c_origin = ipv6_hdr(skb)->saddr;
|
|
c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
|
|
|
|
/*
|
|
* Reflect first query at pim6sd
|
|
*/
|
|
if ((err = ip6mr_cache_report(skb, mifi, MRT6MSG_NOCACHE)) < 0) {
|
|
/* If the report failed throw the cache entry
|
|
out - Brad Parker
|
|
*/
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
|
|
kmem_cache_free(mrt_cachep, c);
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
atomic_inc(&cache_resolve_queue_len);
|
|
c->next = mfc_unres_queue;
|
|
mfc_unres_queue = c;
|
|
|
|
ipmr_do_expire_process(1);
|
|
}
|
|
|
|
/*
|
|
* See if we can append the packet
|
|
*/
|
|
if (c->mfc_un.unres.unresolved.qlen > 3) {
|
|
kfree_skb(skb);
|
|
err = -ENOBUFS;
|
|
} else {
|
|
skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
|
|
err = 0;
|
|
}
|
|
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* MFC6 cache manipulation by user space
|
|
*/
|
|
|
|
static int ip6mr_mfc_delete(struct mf6cctl *mfc)
|
|
{
|
|
int line;
|
|
struct mfc6_cache *c, **cp;
|
|
|
|
line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
|
|
|
|
for (cp = &mfc6_cache_array[line]; (c = *cp) != NULL; cp = &c->next) {
|
|
if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
|
|
ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) {
|
|
write_lock_bh(&mrt_lock);
|
|
*cp = c->next;
|
|
write_unlock_bh(&mrt_lock);
|
|
|
|
kmem_cache_free(mrt_cachep, c);
|
|
return 0;
|
|
}
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
|
|
static int ip6mr_device_event(struct notifier_block *this,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = ptr;
|
|
struct mif_device *v;
|
|
int ct;
|
|
|
|
if (!net_eq(dev_net(dev), &init_net))
|
|
return NOTIFY_DONE;
|
|
|
|
if (event != NETDEV_UNREGISTER)
|
|
return NOTIFY_DONE;
|
|
|
|
v = &vif6_table[0];
|
|
for (ct = 0; ct < maxvif; ct++, v++) {
|
|
if (v->dev == dev)
|
|
mif6_delete(ct);
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block ip6_mr_notifier = {
|
|
.notifier_call = ip6mr_device_event
|
|
};
|
|
|
|
/*
|
|
* Setup for IP multicast routing
|
|
*/
|
|
|
|
int __init ip6_mr_init(void)
|
|
{
|
|
int err;
|
|
|
|
mrt_cachep = kmem_cache_create("ip6_mrt_cache",
|
|
sizeof(struct mfc6_cache),
|
|
0, SLAB_HWCACHE_ALIGN,
|
|
NULL);
|
|
if (!mrt_cachep)
|
|
return -ENOMEM;
|
|
|
|
setup_timer(&ipmr_expire_timer, ipmr_expire_process, 0);
|
|
err = register_netdevice_notifier(&ip6_mr_notifier);
|
|
if (err)
|
|
goto reg_notif_fail;
|
|
#ifdef CONFIG_PROC_FS
|
|
err = -ENOMEM;
|
|
if (!proc_net_fops_create(&init_net, "ip6_mr_vif", 0, &ip6mr_vif_fops))
|
|
goto proc_vif_fail;
|
|
if (!proc_net_fops_create(&init_net, "ip6_mr_cache",
|
|
0, &ip6mr_mfc_fops))
|
|
goto proc_cache_fail;
|
|
#endif
|
|
return 0;
|
|
reg_notif_fail:
|
|
kmem_cache_destroy(mrt_cachep);
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_vif_fail:
|
|
unregister_netdevice_notifier(&ip6_mr_notifier);
|
|
proc_cache_fail:
|
|
proc_net_remove(&init_net, "ip6_mr_vif");
|
|
#endif
|
|
return err;
|
|
}
|
|
|
|
void ip6_mr_cleanup(void)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_net_remove(&init_net, "ip6_mr_cache");
|
|
proc_net_remove(&init_net, "ip6_mr_vif");
|
|
#endif
|
|
unregister_netdevice_notifier(&ip6_mr_notifier);
|
|
del_timer(&ipmr_expire_timer);
|
|
kmem_cache_destroy(mrt_cachep);
|
|
}
|
|
|
|
static int ip6mr_mfc_add(struct mf6cctl *mfc, int mrtsock)
|
|
{
|
|
int line;
|
|
struct mfc6_cache *uc, *c, **cp;
|
|
unsigned char ttls[MAXMIFS];
|
|
int i;
|
|
|
|
memset(ttls, 255, MAXMIFS);
|
|
for (i = 0; i < MAXMIFS; i++) {
|
|
if (IF_ISSET(i, &mfc->mf6cc_ifset))
|
|
ttls[i] = 1;
|
|
|
|
}
|
|
|
|
line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
|
|
|
|
for (cp = &mfc6_cache_array[line]; (c = *cp) != NULL; cp = &c->next) {
|
|
if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
|
|
ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr))
|
|
break;
|
|
}
|
|
|
|
if (c != NULL) {
|
|
write_lock_bh(&mrt_lock);
|
|
c->mf6c_parent = mfc->mf6cc_parent;
|
|
ip6mr_update_thresholds(c, ttls);
|
|
if (!mrtsock)
|
|
c->mfc_flags |= MFC_STATIC;
|
|
write_unlock_bh(&mrt_lock);
|
|
return 0;
|
|
}
|
|
|
|
if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
|
|
return -EINVAL;
|
|
|
|
c = ip6mr_cache_alloc();
|
|
if (c == NULL)
|
|
return -ENOMEM;
|
|
|
|
c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
|
|
c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
|
|
c->mf6c_parent = mfc->mf6cc_parent;
|
|
ip6mr_update_thresholds(c, ttls);
|
|
if (!mrtsock)
|
|
c->mfc_flags |= MFC_STATIC;
|
|
|
|
write_lock_bh(&mrt_lock);
|
|
c->next = mfc6_cache_array[line];
|
|
mfc6_cache_array[line] = c;
|
|
write_unlock_bh(&mrt_lock);
|
|
|
|
/*
|
|
* Check to see if we resolved a queued list. If so we
|
|
* need to send on the frames and tidy up.
|
|
*/
|
|
spin_lock_bh(&mfc_unres_lock);
|
|
for (cp = &mfc_unres_queue; (uc = *cp) != NULL;
|
|
cp = &uc->next) {
|
|
if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
|
|
ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
|
|
*cp = uc->next;
|
|
if (atomic_dec_and_test(&cache_resolve_queue_len))
|
|
del_timer(&ipmr_expire_timer);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
|
|
if (uc) {
|
|
ip6mr_cache_resolve(uc, c);
|
|
kmem_cache_free(mrt_cachep, uc);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Close the multicast socket, and clear the vif tables etc
|
|
*/
|
|
|
|
static void mroute_clean_tables(struct sock *sk)
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* Shut down all active vif entries
|
|
*/
|
|
for (i = 0; i < maxvif; i++) {
|
|
if (!(vif6_table[i].flags & VIFF_STATIC))
|
|
mif6_delete(i);
|
|
}
|
|
|
|
/*
|
|
* Wipe the cache
|
|
*/
|
|
for (i = 0; i < ARRAY_SIZE(mfc6_cache_array); i++) {
|
|
struct mfc6_cache *c, **cp;
|
|
|
|
cp = &mfc6_cache_array[i];
|
|
while ((c = *cp) != NULL) {
|
|
if (c->mfc_flags & MFC_STATIC) {
|
|
cp = &c->next;
|
|
continue;
|
|
}
|
|
write_lock_bh(&mrt_lock);
|
|
*cp = c->next;
|
|
write_unlock_bh(&mrt_lock);
|
|
|
|
kmem_cache_free(mrt_cachep, c);
|
|
}
|
|
}
|
|
|
|
if (atomic_read(&cache_resolve_queue_len) != 0) {
|
|
struct mfc6_cache *c;
|
|
|
|
spin_lock_bh(&mfc_unres_lock);
|
|
while (mfc_unres_queue != NULL) {
|
|
c = mfc_unres_queue;
|
|
mfc_unres_queue = c->next;
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
|
|
ip6mr_destroy_unres(c);
|
|
|
|
spin_lock_bh(&mfc_unres_lock);
|
|
}
|
|
spin_unlock_bh(&mfc_unres_lock);
|
|
}
|
|
}
|
|
|
|
static int ip6mr_sk_init(struct sock *sk)
|
|
{
|
|
int err = 0;
|
|
|
|
rtnl_lock();
|
|
write_lock_bh(&mrt_lock);
|
|
if (likely(mroute6_socket == NULL))
|
|
mroute6_socket = sk;
|
|
else
|
|
err = -EADDRINUSE;
|
|
write_unlock_bh(&mrt_lock);
|
|
|
|
rtnl_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
int ip6mr_sk_done(struct sock *sk)
|
|
{
|
|
int err = 0;
|
|
|
|
rtnl_lock();
|
|
if (sk == mroute6_socket) {
|
|
write_lock_bh(&mrt_lock);
|
|
mroute6_socket = NULL;
|
|
write_unlock_bh(&mrt_lock);
|
|
|
|
mroute_clean_tables(sk);
|
|
} else
|
|
err = -EACCES;
|
|
rtnl_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Socket options and virtual interface manipulation. The whole
|
|
* virtual interface system is a complete heap, but unfortunately
|
|
* that's how BSD mrouted happens to think. Maybe one day with a proper
|
|
* MOSPF/PIM router set up we can clean this up.
|
|
*/
|
|
|
|
int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, int optlen)
|
|
{
|
|
int ret;
|
|
struct mif6ctl vif;
|
|
struct mf6cctl mfc;
|
|
mifi_t mifi;
|
|
|
|
if (optname != MRT6_INIT) {
|
|
if (sk != mroute6_socket && !capable(CAP_NET_ADMIN))
|
|
return -EACCES;
|
|
}
|
|
|
|
switch (optname) {
|
|
case MRT6_INIT:
|
|
if (sk->sk_type != SOCK_RAW ||
|
|
inet_sk(sk)->num != IPPROTO_ICMPV6)
|
|
return -EOPNOTSUPP;
|
|
if (optlen < sizeof(int))
|
|
return -EINVAL;
|
|
|
|
return ip6mr_sk_init(sk);
|
|
|
|
case MRT6_DONE:
|
|
return ip6mr_sk_done(sk);
|
|
|
|
case MRT6_ADD_MIF:
|
|
if (optlen < sizeof(vif))
|
|
return -EINVAL;
|
|
if (copy_from_user(&vif, optval, sizeof(vif)))
|
|
return -EFAULT;
|
|
if (vif.mif6c_mifi >= MAXMIFS)
|
|
return -ENFILE;
|
|
rtnl_lock();
|
|
ret = mif6_add(&vif, sk == mroute6_socket);
|
|
rtnl_unlock();
|
|
return ret;
|
|
|
|
case MRT6_DEL_MIF:
|
|
if (optlen < sizeof(mifi_t))
|
|
return -EINVAL;
|
|
if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
|
|
return -EFAULT;
|
|
rtnl_lock();
|
|
ret = mif6_delete(mifi);
|
|
rtnl_unlock();
|
|
return ret;
|
|
|
|
/*
|
|
* Manipulate the forwarding caches. These live
|
|
* in a sort of kernel/user symbiosis.
|
|
*/
|
|
case MRT6_ADD_MFC:
|
|
case MRT6_DEL_MFC:
|
|
if (optlen < sizeof(mfc))
|
|
return -EINVAL;
|
|
if (copy_from_user(&mfc, optval, sizeof(mfc)))
|
|
return -EFAULT;
|
|
rtnl_lock();
|
|
if (optname == MRT6_DEL_MFC)
|
|
ret = ip6mr_mfc_delete(&mfc);
|
|
else
|
|
ret = ip6mr_mfc_add(&mfc, sk == mroute6_socket);
|
|
rtnl_unlock();
|
|
return ret;
|
|
|
|
/*
|
|
* Control PIM assert (to activate pim will activate assert)
|
|
*/
|
|
case MRT6_ASSERT:
|
|
{
|
|
int v;
|
|
if (get_user(v, (int __user *)optval))
|
|
return -EFAULT;
|
|
mroute_do_assert = !!v;
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
case MRT6_PIM:
|
|
{
|
|
int v;
|
|
if (get_user(v, (int __user *)optval))
|
|
return -EFAULT;
|
|
v = !!v;
|
|
rtnl_lock();
|
|
ret = 0;
|
|
if (v != mroute_do_pim) {
|
|
mroute_do_pim = v;
|
|
mroute_do_assert = v;
|
|
if (mroute_do_pim)
|
|
ret = inet6_add_protocol(&pim6_protocol,
|
|
IPPROTO_PIM);
|
|
else
|
|
ret = inet6_del_protocol(&pim6_protocol,
|
|
IPPROTO_PIM);
|
|
if (ret < 0)
|
|
ret = -EAGAIN;
|
|
}
|
|
rtnl_unlock();
|
|
return ret;
|
|
}
|
|
|
|
#endif
|
|
/*
|
|
* Spurious command, or MRT6_VERSION which you cannot
|
|
* set.
|
|
*/
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Getsock opt support for the multicast routing system.
|
|
*/
|
|
|
|
int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
|
|
int __user *optlen)
|
|
{
|
|
int olr;
|
|
int val;
|
|
|
|
switch (optname) {
|
|
case MRT6_VERSION:
|
|
val = 0x0305;
|
|
break;
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
case MRT6_PIM:
|
|
val = mroute_do_pim;
|
|
break;
|
|
#endif
|
|
case MRT6_ASSERT:
|
|
val = mroute_do_assert;
|
|
break;
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
if (get_user(olr, optlen))
|
|
return -EFAULT;
|
|
|
|
olr = min_t(int, olr, sizeof(int));
|
|
if (olr < 0)
|
|
return -EINVAL;
|
|
|
|
if (put_user(olr, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval, &val, olr))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The IP multicast ioctl support routines.
|
|
*/
|
|
|
|
int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
|
|
{
|
|
struct sioc_sg_req6 sr;
|
|
struct sioc_mif_req6 vr;
|
|
struct mif_device *vif;
|
|
struct mfc6_cache *c;
|
|
|
|
switch (cmd) {
|
|
case SIOCGETMIFCNT_IN6:
|
|
if (copy_from_user(&vr, arg, sizeof(vr)))
|
|
return -EFAULT;
|
|
if (vr.mifi >= maxvif)
|
|
return -EINVAL;
|
|
read_lock(&mrt_lock);
|
|
vif = &vif6_table[vr.mifi];
|
|
if (MIF_EXISTS(vr.mifi)) {
|
|
vr.icount = vif->pkt_in;
|
|
vr.ocount = vif->pkt_out;
|
|
vr.ibytes = vif->bytes_in;
|
|
vr.obytes = vif->bytes_out;
|
|
read_unlock(&mrt_lock);
|
|
|
|
if (copy_to_user(arg, &vr, sizeof(vr)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
read_unlock(&mrt_lock);
|
|
return -EADDRNOTAVAIL;
|
|
case SIOCGETSGCNT_IN6:
|
|
if (copy_from_user(&sr, arg, sizeof(sr)))
|
|
return -EFAULT;
|
|
|
|
read_lock(&mrt_lock);
|
|
c = ip6mr_cache_find(&sr.src.sin6_addr, &sr.grp.sin6_addr);
|
|
if (c) {
|
|
sr.pktcnt = c->mfc_un.res.pkt;
|
|
sr.bytecnt = c->mfc_un.res.bytes;
|
|
sr.wrong_if = c->mfc_un.res.wrong_if;
|
|
read_unlock(&mrt_lock);
|
|
|
|
if (copy_to_user(arg, &sr, sizeof(sr)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
read_unlock(&mrt_lock);
|
|
return -EADDRNOTAVAIL;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
|
|
|
|
static inline int ip6mr_forward2_finish(struct sk_buff *skb)
|
|
{
|
|
IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_OUTFORWDATAGRAMS);
|
|
return dst_output(skb);
|
|
}
|
|
|
|
/*
|
|
* Processing handlers for ip6mr_forward
|
|
*/
|
|
|
|
static int ip6mr_forward2(struct sk_buff *skb, struct mfc6_cache *c, int vifi)
|
|
{
|
|
struct ipv6hdr *ipv6h;
|
|
struct mif_device *vif = &vif6_table[vifi];
|
|
struct net_device *dev;
|
|
struct dst_entry *dst;
|
|
struct flowi fl;
|
|
|
|
if (vif->dev == NULL)
|
|
goto out_free;
|
|
|
|
#ifdef CONFIG_IPV6_PIMSM_V2
|
|
if (vif->flags & MIFF_REGISTER) {
|
|
vif->pkt_out++;
|
|
vif->bytes_out += skb->len;
|
|
vif->dev->stats.tx_bytes += skb->len;
|
|
vif->dev->stats.tx_packets++;
|
|
ip6mr_cache_report(skb, vifi, MRT6MSG_WHOLEPKT);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
ipv6h = ipv6_hdr(skb);
|
|
|
|
fl = (struct flowi) {
|
|
.oif = vif->link,
|
|
.nl_u = { .ip6_u =
|
|
{ .daddr = ipv6h->daddr, }
|
|
}
|
|
};
|
|
|
|
dst = ip6_route_output(&init_net, NULL, &fl);
|
|
if (!dst)
|
|
goto out_free;
|
|
|
|
dst_release(skb->dst);
|
|
skb->dst = dst;
|
|
|
|
/*
|
|
* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
|
|
* not only before forwarding, but after forwarding on all output
|
|
* interfaces. It is clear, if mrouter runs a multicasting
|
|
* program, it should receive packets not depending to what interface
|
|
* program is joined.
|
|
* If we will not make it, the program will have to join on all
|
|
* interfaces. On the other hand, multihoming host (or router, but
|
|
* not mrouter) cannot join to more than one interface - it will
|
|
* result in receiving multiple packets.
|
|
*/
|
|
dev = vif->dev;
|
|
skb->dev = dev;
|
|
vif->pkt_out++;
|
|
vif->bytes_out += skb->len;
|
|
|
|
/* We are about to write */
|
|
/* XXX: extension headers? */
|
|
if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
|
|
goto out_free;
|
|
|
|
ipv6h = ipv6_hdr(skb);
|
|
ipv6h->hop_limit--;
|
|
|
|
IP6CB(skb)->flags |= IP6SKB_FORWARDED;
|
|
|
|
return NF_HOOK(PF_INET6, NF_INET_FORWARD, skb, skb->dev, dev,
|
|
ip6mr_forward2_finish);
|
|
|
|
out_free:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int ip6mr_find_vif(struct net_device *dev)
|
|
{
|
|
int ct;
|
|
for (ct = maxvif - 1; ct >= 0; ct--) {
|
|
if (vif6_table[ct].dev == dev)
|
|
break;
|
|
}
|
|
return ct;
|
|
}
|
|
|
|
static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache)
|
|
{
|
|
int psend = -1;
|
|
int vif, ct;
|
|
|
|
vif = cache->mf6c_parent;
|
|
cache->mfc_un.res.pkt++;
|
|
cache->mfc_un.res.bytes += skb->len;
|
|
|
|
/*
|
|
* Wrong interface: drop packet and (maybe) send PIM assert.
|
|
*/
|
|
if (vif6_table[vif].dev != skb->dev) {
|
|
int true_vifi;
|
|
|
|
cache->mfc_un.res.wrong_if++;
|
|
true_vifi = ip6mr_find_vif(skb->dev);
|
|
|
|
if (true_vifi >= 0 && mroute_do_assert &&
|
|
/* pimsm uses asserts, when switching from RPT to SPT,
|
|
so that we cannot check that packet arrived on an oif.
|
|
It is bad, but otherwise we would need to move pretty
|
|
large chunk of pimd to kernel. Ough... --ANK
|
|
*/
|
|
(mroute_do_pim || cache->mfc_un.res.ttls[true_vifi] < 255) &&
|
|
time_after(jiffies,
|
|
cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
|
|
cache->mfc_un.res.last_assert = jiffies;
|
|
ip6mr_cache_report(skb, true_vifi, MRT6MSG_WRONGMIF);
|
|
}
|
|
goto dont_forward;
|
|
}
|
|
|
|
vif6_table[vif].pkt_in++;
|
|
vif6_table[vif].bytes_in += skb->len;
|
|
|
|
/*
|
|
* Forward the frame
|
|
*/
|
|
for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) {
|
|
if (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) {
|
|
if (psend != -1) {
|
|
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
if (skb2)
|
|
ip6mr_forward2(skb2, cache, psend);
|
|
}
|
|
psend = ct;
|
|
}
|
|
}
|
|
if (psend != -1) {
|
|
ip6mr_forward2(skb, cache, psend);
|
|
return 0;
|
|
}
|
|
|
|
dont_forward:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Multicast packets for forwarding arrive here
|
|
*/
|
|
|
|
int ip6_mr_input(struct sk_buff *skb)
|
|
{
|
|
struct mfc6_cache *cache;
|
|
|
|
read_lock(&mrt_lock);
|
|
cache = ip6mr_cache_find(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
|
|
|
|
/*
|
|
* No usable cache entry
|
|
*/
|
|
if (cache == NULL) {
|
|
int vif;
|
|
|
|
vif = ip6mr_find_vif(skb->dev);
|
|
if (vif >= 0) {
|
|
int err = ip6mr_cache_unresolved(vif, skb);
|
|
read_unlock(&mrt_lock);
|
|
|
|
return err;
|
|
}
|
|
read_unlock(&mrt_lock);
|
|
kfree_skb(skb);
|
|
return -ENODEV;
|
|
}
|
|
|
|
ip6_mr_forward(skb, cache);
|
|
|
|
read_unlock(&mrt_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm)
|
|
{
|
|
int ct;
|
|
struct rtnexthop *nhp;
|
|
struct net_device *dev = vif6_table[c->mf6c_parent].dev;
|
|
u8 *b = skb_tail_pointer(skb);
|
|
struct rtattr *mp_head;
|
|
|
|
if (dev)
|
|
RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex);
|
|
|
|
mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0));
|
|
|
|
for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
|
|
if (c->mfc_un.res.ttls[ct] < 255) {
|
|
if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
|
|
goto rtattr_failure;
|
|
nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));
|
|
nhp->rtnh_flags = 0;
|
|
nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
|
|
nhp->rtnh_ifindex = vif6_table[ct].dev->ifindex;
|
|
nhp->rtnh_len = sizeof(*nhp);
|
|
}
|
|
}
|
|
mp_head->rta_type = RTA_MULTIPATH;
|
|
mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head;
|
|
rtm->rtm_type = RTN_MULTICAST;
|
|
return 1;
|
|
|
|
rtattr_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
int ip6mr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait)
|
|
{
|
|
int err;
|
|
struct mfc6_cache *cache;
|
|
struct rt6_info *rt = (struct rt6_info *)skb->dst;
|
|
|
|
read_lock(&mrt_lock);
|
|
cache = ip6mr_cache_find(&rt->rt6i_src.addr, &rt->rt6i_dst.addr);
|
|
|
|
if (!cache) {
|
|
struct sk_buff *skb2;
|
|
struct ipv6hdr *iph;
|
|
struct net_device *dev;
|
|
int vif;
|
|
|
|
if (nowait) {
|
|
read_unlock(&mrt_lock);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
dev = skb->dev;
|
|
if (dev == NULL || (vif = ip6mr_find_vif(dev)) < 0) {
|
|
read_unlock(&mrt_lock);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* really correct? */
|
|
skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
|
|
if (!skb2) {
|
|
read_unlock(&mrt_lock);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
skb_reset_transport_header(skb2);
|
|
|
|
skb_put(skb2, sizeof(struct ipv6hdr));
|
|
skb_reset_network_header(skb2);
|
|
|
|
iph = ipv6_hdr(skb2);
|
|
iph->version = 0;
|
|
iph->priority = 0;
|
|
iph->flow_lbl[0] = 0;
|
|
iph->flow_lbl[1] = 0;
|
|
iph->flow_lbl[2] = 0;
|
|
iph->payload_len = 0;
|
|
iph->nexthdr = IPPROTO_NONE;
|
|
iph->hop_limit = 0;
|
|
ipv6_addr_copy(&iph->saddr, &rt->rt6i_src.addr);
|
|
ipv6_addr_copy(&iph->daddr, &rt->rt6i_dst.addr);
|
|
|
|
err = ip6mr_cache_unresolved(vif, skb2);
|
|
read_unlock(&mrt_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY))
|
|
cache->mfc_flags |= MFC_NOTIFY;
|
|
|
|
err = ip6mr_fill_mroute(skb, cache, rtm);
|
|
read_unlock(&mrt_lock);
|
|
return err;
|
|
}
|
|
|